A4 Sedan V6-2.8L (AFC) (1996)
Fuel Level Signal: Testing and Inspection
NOTE:
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If the fuel level in the tank is too low (less than 3.2 gal); combustion misfire, oxygen sensor and fuel system malfunctions could occur. In these
cases the malfunction "Fuel tank level too low" is stored in DTC memory.
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The fuel tank level signal is monitored by the Engine Control Module (ECM).
Checking requirements:
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Control Module coding OK, Refer to "Code Control Module". See: Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool
Testing/Code Control Module (Function 07)
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Fuel content greater than 3.2 gal (12 liters).
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Instrument cluster fuel gauge OK.
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Switch ignition ON.
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Using VAG 1551 scan tool, select "Read Measuring Value Block" function 08, display group 027, display field 2, refer to "Read Measuring Value
Block (Function 08)". See: Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Read Measuring Value Block (Function
08)
Indicated on display; note display field 2
Read measuring value block 27
->
1
2
3
4
Specified value: 0
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Start engine and let idle.
Specified value: 1
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Press -> button.
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Select "End Output" function 06.
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Press -Q- button to confirm input.
If the specified value is not obtained, even though coding is OK:
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Connect VAG 1598/19 test box to ECM harness connector.
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Check wiring for open or short circuit between ECM and instrument cluster, using wiring diagram.